Port over some fixes from #3747 (#5940)

crates/ruff/src/rules/flake8_builtins/rules/rules.rs

@@ -1 +0,0 @@
-

crates/ruff/src/rules/pygrep_hooks/mod.rs

@@ -23,7 +23,7 @@ mod tests {
     fn rules(rule_code: Rule, path: &Path) -> Result<()> {
         let snapshot = format!("{}_{}", rule_code.noqa_code(), path.to_string_lossy());
         let diagnostics = test_path(
-            Path::new("pygrep-hooks").join(path).as_path(),
+            Path::new("pygrep_hooks").join(path).as_path(),
             &settings::Settings::for_rule(rule_code),
         )?;
         assert_messages!(snapshot, diagnostics);

scripts/add_plugin.py

@@ -5,7 +5,7 @@ Example usage:
 
     python scripts/add_plugin.py \
         flake8-pie \
-        --url https://pypi.org/project/flake8-pie/
+        --url https://pypi.org/project/flake8-pie/ \
         --prefix PIE
 """
 from __future__ import annotations